<!DOCTYPE html>
<html lang="en" xmlns:th="https://www.thymeleaf.org">
<head>
  <meta charset="UTF-8">
  <title>Title</title>
</head>
<body>
username: <span th:text="${username}"></span><br>
session.login_user: <span th:text="${session.login_user}"></span><br>

</body>
</html>